Software Alternatives, Accelerators & Startups

grommunio

grommunio (formerly known as grammm) efficiently combines all requirements of modern, digital communication and collaboration.

Best grommunio Alternatives & Competitors in 2025

The best grommunio alternatives based on verified products, community votes, reviews and other factors.
Filter: 4 Open-Source Alternatives. Latest update:

  1. Kolab Groupware is a secure, scalable, reliable, flexible, full-featured collaboration suite.

    /kolab-community-alternatives
  2. Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.

    /zimbra-alternatives
  3. As the only API powered by the Prince HTML-to-PDF engine, DocRaptor provides the best support for complex PDFs with powerful support for headers, page breaks, page numbers, flexbox, watermarks, accessible PDFs, and much more

    Try for free paid Free Trial $15.0 / Monthly (125+ Documents)

    Try for free
  4. Sharing & communication software for business

    /kopano-alternatives
  5. On-premises, enterprise collaboration solution for documents, emails, calendars and more.

    /nextcloud-hub-alternatives
  6. A fully fledged, free email server solution, an open source project (GPL v2).

    Open Source

    /iredmail-alternatives
  7. Axigen is an integrated email, calendaring & collaboration platform, built on a Linux mail server technology.

    /axigen-alternatives
  8. An open source mailserver suite.

    Open Source

    /mailcow-alternatives
  9. Protect mail server against spam, viruses and malware with Proxmox Mail Gateway security for businesses, government, education and non-profit organizations.

    /proxmox-mail-gateway-alternatives
  10. Google's encompassing suite of cloud-based business apps.

    /google-workspace-alternatives
  11. Horde Groupware is a free, enterprise ready, browser based collaboration suite.

    /horde-alternatives
  12. IceWarp integrates all communication & collaboration features in one unified solution.

    paid Free Trial $2.8 / Monthly (Lite)

    /icewarp-alternatives
  13. With Nextcloud enterprises host their own secure cloud solution for storage, collaboration & communication from any device, anywhere.

    Open Source

    /nextcloud-alternatives
  14. Open-Xchange Server 6 is the most advanced Linux based Groupware solution f.

    /ox-open-xchange-alternatives
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